Improvement in hot-ai r furnaces



2 Sheets-Sheet 2. S. W. NORTON.

a Hot Air Furnace.

Patented Feb. 20, 1866.

UNITED STATES PATENT OFFIGEO' S. W. NORTON, OF LEMONT, ILLINOIS.

IMPROVEMENT IN HOT-AIRv FURNACES.

Specification forming part of Letters Patent No. 52,738, dated February20, 1866.

To all whom it may concern:

Be it known that I, S. W. NORTON, of Lemont, in the county of Cook andState of Illinois, have invented a new and useful I mprovement inHot-Air Furnaces; and I do hereby declare that the following is a full,clear, and exact description thereof, which will enable those skilled inthe art to make and use the same.

This invention relates particularly to a hotair furnace to be used inconnection with graindrying apparatuses, and itis especially adapted toa grain-drier which forms the subjectof asep-- arate application forLetters Patent bearing even date herewith; and it consists in passing anair-blast through the products of combustion contained in the fire-potof the furnace,tl1eamount or quantity of which it comes in contact withbeing regulated by means of a novel arrangement within the fire pot orchamber, which, as it is raised or lowered. ex-

poses a greater or lesser quantity of the combustible products of thefire-chamber to the action of the air-blast, as will be hereinafterexplained, reference being had to the accompanying plate of drawings, ofwhich- Figure l isa front elevation of my improved hot-air furnace, andFig. 2 a central transverse vertical section taken in the plane of theline .00 a, Fig. 1.

Ain the drawings represents the tire-pot or combustion-chamber of thefurnace; B, the fire-grate; O, the feed-door, having extending from itsinside down toward the fire-grate a curved or bent spout, D, throughwhich the coal or'other combustible material used, when thrown throughthe door 0, passes to the grate-bars E, a sleeve surrounding the saidspout D, which sleeve is hung by chains F F at each end to a Windlass orshaft, G, of the fire-pot, having a winch-handle, H, for convenience inturning it, and by turning which to the right or left the said sleeve iseither raised or lowered, as the case may be, the chains by which thesleeve is suspended either then winding upon or unwinding from the saidshaft 0.

The front of the fire-potA is open at L, and to such opening anysuitable fan-blower or other similar device for creating an air-blast isconnected, the rear of the fire-chamber directly opposite to its openfront L being also made open and connected with the interior of thegrain-drying apparatus with which it is intended to be used, whereby,asis obvious, the air-blast forced into the furnace will pass across andover the tire-grate thereof, consequently mingling with such portions ofthe combustible material of the fire-chamber as are exposed to itsaction, the amount of which will be regulated by raising or lowering thesaid sleeve E, as is obvious without further explanation. By thussubjecting a greater or lesser quantity of the combustible products inthe tire-pot to the action of the airblast forced across and through thesame, it is manifest that the degree to which the airblast is heated asit passes through the fur- S. W. NORTON.

Witnesses:

JAMES A. BORLAND, E. T. SINGER.

